debugobjects: Track object usage to avoid premature freeing of objects

The freelist is freed at a constant rate independent of the actual usage
requirements. That's bad in scenarios where usage comes in bursts. The end
of a burst puts the objects on the free list and freeing proceeds even when
the next burst which requires objects started again.

Keep track of the usage with a exponentially wheighted moving average and
take that into account in the worker function which frees objects from the
free list.

This further reduces the kmem_cache allocation/free rate for a full kernel
compile:

   	    kmem_cache_alloc()	kmem_cache_free()
Baseline:   225k		173k
Usage:	    170k		117k

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Zhen Lei <[email protected]>
Link: https://lore.kernel.org/all/87bjznhme2.ffs@tglx

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